arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.05286physics.comp-ph
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快速稳定的行列式量子蒙特卡罗

Fast and stable determinant quantum Monte Carlo

Carsten Bauer

摘要:

我们评估了费米子多体量子蒙特卡罗模拟中采用的数值稳定方法。特别是,我们凭经验比较各种矩阵分解和反演方案,以获得控制的数值不稳定性所产生的计算等时间和时间位移的格林函数内的决定性量子蒙特卡罗(DQMC)框架。基于这种比较,我们确定了一个程序的基础上枢轴QR分解,这是既有效又准确的机器精度。Julia编程语言用于评估,所有讨论的算法的实现在开源软件库StableDQMC.jl [http://github.com/crstnbr/StableDQMC.jl]中提供。

英文摘要:

We assess numerical stabilization methods employed in fermion many-body quantum Monte Carlo simulations. In particular, we empirically compare various matrix decomposition and inversion schemes to gain control over numerical instabilities arising in the computation of equal-time and time-displaced Green's functions within the determinant quantum Monte Carlo (DQMC) framework. Based on this comparison, we identify a procedure based on pivoted QR decompositions which is both efficient and accurate to machine precision. The Julia programming language is used for the assessment and implementations of all discussed algorithms are provided in the open-source software library StableDQMC.jl [http://github.com/crstnbr/StableDQMC.jl].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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